Means for joining electrodes.



E. & H. VIERTB MEANS FOR JOINING ELEG APPLICATION FILED MAR.21,

Patented J an. 7,

Ji'a 3 M 545 5 4, Vii/m M V a- L I STATES PATENT oFFIoE.

mumymnm, or mmow, mam BERLIN, AND HEBMANN vmn'rnn, or 33cm mmm; 2mm BERLIN, GERMANY, assrenons 'ro ennmmnnn" SIEMENS 1:00., or. max mum, mum BERLIN, GERMANY, A GERMAN corsnrnnnsm.

FOR JOINING ELECTRODES.

Specification of Letters Patent. application filed March-21, 1912. Serial No. 885,305.

Patentd Jan. 7, 1913.

To all whom it may concern:

Be it known that we, EDUARD VIERTEL and HERMANN Vmnm, citizens of the Empire of Germany, and residing, respectively, at Treptow and Lichtenberg, near Berlin, Germany, have invented certain new and useful Improvements in Means for Joining Electrodes, of which the following is a specification.

Our invention relates to means for join-.

particularly for use 1n electr1c ing electrodes furnaces.

Electrodes for workin electric furnaces are in many cases provi ed with a female screw-thread and nipple in order that several electrodes may be joined together whereby unused ends are avoided and continuous working is enabled. Now as screw-threads.

can be made exactly in the carbon or graphite of the electrodes only with very great difiiculty,'as a rule the screw-threaded nipples are made a little smaller than the appertaining screw thread. Consequently, there is play between the nlpple and electrode so that the joined electrodes are frequently not in alinement.

A primary object of our invention 1s to remedy this defect. To this end we provide the tapped ends of the electrodes with centering means as described hereinafter andpointed outin the claims. 0

One illustrative embodiment of our invention and a modification thereof are represented by way of example in the accompanying drawing, wherein Figure 1 is a section showing the known means for joining electrodes referred to above, Fig. 2 is a like view showing electrodes joined according to our invention, and

Fig. 3 is a like view showing a modified connection of electrodes according to our invention. v

Referring to the drawing, Fig. 1 shows two tapped ends of electrodes 1, 2 joined in the known defective, above-described manner by the nipple 3.

According to our invention we provide the tapped ends of the electrodes withcylindrical, conical or otherwise shaped centering means which may be, for example, projections or recesses.

In an embodiment shown in Fig. 2 an annular centering member is constituted by the projection'2" of the electrode'2 which fits into the corresppnding recess 1 in the electrode 1 As em odied in Fig. 3 the electrodes land 2 have recesses 1' and 2', respectivel and a centering annulus is constitu y a separate member 4 which exactly fits the two recesses In this manner it is possible to join the electrodes exactly coaxially, the exact alinement being guaranteed even when the screwed connections are inexact, i. e. are made with play.

The exactness of the alinement or centering is increased still more when the centering faces are turned on a lathe. On the other hand, it is, in general, not necessary to true the screw-threads on the lathe, whereby considerable saving in labor is obtained.

We claim 1. The combination, with two electrodes each having a tapped end, of a nipp screwed into the tapped ends, the tapped end of each electrode being provided wlth centering means, substantially as described, for the purpose specified.

2. The combination, with two electrodes each having a tapped end, of a nipple screwed into the tapped ends, the tapped ends of said electrodes bein provided with centering means adapted to interact between screwed into the tapped ends, the tapped end of one electrode being provided with an axial recess, and a centering wedge adapted to fit said recess exactly and to bring the tapped end of the other electrode into exact alinement with the first electrode.

5. The combination with a pair of electrodes provided with means for drawing them endwise into close abutment, sai

means bein adapted to approximately aline the axes 0 said electrodes, of a centering member interposed between said electrodes, and adapted to perfect the. alinement of said axes.

, 5 provided with means adapted to perfect the The combination with two electrodes nalnes to this specification in the presence of ha vin abutting ends, of a threaded connectwo witnesses.

tion a apted to approximately aline the axis EDUARD VIERTEL. of said electrode, said abutting ends being HERMANN VIERTEL. Witnesses HENRY Hum, Womnmn Ham.

alinement.

In testimony whereof, we have signed our 

